Basaltic granitic and andesitic are the three basic compositional types of magma molten rock beneath earth s. Gases expand within a magma as it nears the earth s surface where pressures are lower the violence of an eruption is related to how easily gases escapes from the magma. First of all you should know the difference between lava and magma magma and lava are both molten liquid rock but magma is moltenrock produced underneath earth surface while it magma erupts on the surface of earth it is called lava.
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